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311 lines
7.6 KiB
C
311 lines
7.6 KiB
C
/*
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $NetBSD: clock.c,v 1.9 2000/01/19 02:52:19 msaitoh Exp $
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*/
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/*
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* Copyright (C) 2001 Benno Rice.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef lint
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/bus.h>
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#include <sys/timetc.h>
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#include <sys/interrupt.h>
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#include <dev/ofw/openfirm.h>
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#include <machine/clock.h>
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#include <machine/cpu.h>
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#include <machine/intr.h>
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#if 0 /* XXX */
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#include "adb.h"
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#else
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#define NADB 0
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#endif
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/*
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* Initially we assume a processor with a bus frequency of 12.5 MHz.
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*/
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static u_long ticks_per_sec = 12500000;
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static u_long ns_per_tick = 80;
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static long ticks_per_intr;
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static volatile u_long lasttb;
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#define SECDAY 86400
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#define DIFF19041970 2082844800
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#if NADB > 0
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extern int adb_read_date_time(int *);
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extern int adb_set_date_time(int);
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#endif
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static int clockinitted = 0;
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static timecounter_get_t powerpc_get_timecount;
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static struct timecounter powerpc_timecounter = {
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powerpc_get_timecount, /* get_timecount */
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0, /* no poll_pps */
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~0u, /* counter_mask */
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0, /* frequency */
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"powerpc" /* name */
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};
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SYSCTL_OPAQUE(_debug, OID_AUTO, powerpc_timecounter, CTLFLAG_RD,
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&powerpc_timecounter, sizeof(powerpc_timecounter), "S,timecounter", "");
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void
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inittodr(time_t base)
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{
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time_t deltat;
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u_int rtc_time;
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struct timespec ts;
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/*
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* If we can't read from RTC, use the fs time.
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*/
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#if NADB > 0
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if (adb_read_date_time(&rtc_time) < 0)
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#endif
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{
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ts.tv_sec = base;
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ts.tv_nsec = 0;
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tc_setclock(&ts);
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return;
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}
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clockinitted = 1;
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ts.tv_sec = rtc_time - DIFF19041970;
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deltat = ts.tv_sec - base;
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if (deltat < 0) {
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deltat = -deltat;
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}
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if (deltat < 2 * SECDAY) {
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tc_setclock(&ts);
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return;
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}
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printf("WARNING: clock %s %d days",
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ts.tv_sec < base ? "lost" : "gained", (int)(deltat / SECDAY));
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printf(" -- CHECK AND RESET THE DATE!\n");
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}
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/*
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* Similar to the above
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*/
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void
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resettodr()
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{
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#if NADB > 0
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u_int rtc_time;
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if (clockinitted) {
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rtc_time = time.tv_sec + DIFF19041970;
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adb_set_date_time(rtc_time);
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}
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#endif
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}
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void
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decr_intr(struct clockframe *frame)
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{
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u_long tb;
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long tick;
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int nticks;
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register_t msr;
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/*
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* Check whether we are initialized.
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*/
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if (!ticks_per_intr)
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return;
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/*
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* Based on the actual time delay since the last decrementer reload,
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* we arrange for earlier interrupt next time.
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*/
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__asm ("mftb %0; mfdec %1" : "=r"(tb), "=r"(tick));
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for (nticks = 0; tick < 0; nticks++)
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tick += ticks_per_intr;
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__asm __volatile ("mtdec %0" :: "r"(tick));
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/*
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* lasttb is used during microtime. Set it to the virtual
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* start of this tick interval.
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*/
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lasttb = tb + tick - ticks_per_intr;
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/*
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* This probably needs some kind of locking.
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*/
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intrcnt[CNT_CLOCK]++;
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nticks += tickspending;
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tickspending = 0;
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/*
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* Reenable interrupts
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*/
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msr = mfmsr();
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mtmsr(msr | PSL_EE | PSL_RI);
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/*
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* Do standard timer interrupt stuff.
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* Do softclock stuff only on the last iteration.
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*/
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while (--nticks > 0) {
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hardclock(frame);
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}
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hardclock(frame);
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}
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void
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cpu_initclocks(void)
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{
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int qhandle, phandle;
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char name[32];
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unsigned int msr;
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phandle = 0;
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/*
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* Get this info during autoconf? XXX
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*/
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for (qhandle = OF_peer(0); qhandle; qhandle = phandle) {
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if (OF_getprop(qhandle, "device_type", name, sizeof name) >= 0
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&& !strcmp(name, "cpu")
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&& OF_getprop(qhandle, "timebase-frequency",
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&ticks_per_sec, sizeof ticks_per_sec) >= 0) {
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/*
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* Should check for correct CPU here? XXX
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*/
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msr = mfmsr();
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mtmsr(msr & ~(PSL_EE|PSL_RI));
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powerpc_timecounter.tc_frequency = ticks_per_sec;
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tc_init(&powerpc_timecounter);
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ns_per_tick = 1000000000 / ticks_per_sec;
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ticks_per_intr = ticks_per_sec / hz;
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__asm __volatile ("mftb %0" : "=r"(lasttb));
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mtdec(ticks_per_intr);
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mtmsr(msr);
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break;
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}
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if ((phandle = OF_child(qhandle)))
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continue;
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while (qhandle) {
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if ((phandle = OF_peer(qhandle)))
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break;
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qhandle = OF_parent(qhandle);
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}
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}
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if (!phandle)
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panic("no cpu node");
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}
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static __inline u_quad_t
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mftb(void)
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{
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u_long scratch;
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u_quad_t tb;
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__asm ("1: mftbu %0; mftb %0+1; mftbu %1; cmpw 0,%0,%1; bne 1b"
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: "=r"(tb), "=r"(scratch));
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return tb;
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}
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static unsigned
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powerpc_get_timecount(struct timecounter *tc)
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{
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return mftb();
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}
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/*
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* Wait for about n microseconds (at least!).
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*/
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void
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delay(int n)
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{
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u_quad_t tb;
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u_long tbh, tbl, scratch;
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tb = mftb();
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tb += (n * 1000 + ns_per_tick - 1) / ns_per_tick;
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tbh = tb >> 32;
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tbl = tb;
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__asm ("1: mftbu %0; cmplw %0,%1; blt 1b; bgt 2f;"
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"mftb %0; cmplw %0,%2; blt 1b; 2:"
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: "=r"(scratch) : "r"(tbh), "r"(tbl));
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}
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/*
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* Nothing to do.
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*/
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void
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setstatclockrate(int arg)
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{
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/* Do nothing */
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}
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